This is definitely lacking in the Freelance world. It may not be as important to most people to have an edge-cutting lap of text on their screen. Eventhough a good content base will seperate you from any other website professionally, most people probably don't find the effort in finding a good content writer or the money they will spend on it worth it. As long as the visitor understands what you're getting at, right?
Lack of Writers, basically because people can do it themselves. Perhaps not professionally, but quite understandable.